1967 年 43 巻 2 号 p. 161-165
Chromosomal features were studied in two lines of the Friend virus-induced tumors of mice in ascites form, one being a virus producing Friend tumor and the other a non-virus producing Friend tumor. Tumor cells having a pseudo-diploid chromosome constitution, 40 in number and characterized by four marker chromosomes, were found to form stemlines of the two tumor lines. The stemline karyotype of the two types of tumors was the same morphologically and numerically in the two lines.